REFLECTOR: Brake Horsepower vs Indicated Horsepower

Jim Agnew jim_agnew_2 at yahoo.com
Sat Feb 5 16:28:54 CST 2005


Larry,

I believe that the 220HP on the PZL Franklin was at 3200 RPM in helicopter
operation at least in the manuals I saw a number of years ago.

Jim
--- Laurence Coen <lwcoen at hotmail.com> wrote:

> BlankThe Franklin 6A350 and the PZL 6A350 are identical in every detail and
> used the same tooling during manufacture.  The sole difference is the
> Franklin was made in the USA and the PZL was made in Poland.  The horsepower
> rating on the Franklin nameplate is 220 @ 2800 RPM.  On the PZL nameplate it
> is 205 @ 2800 RPM.  The question is; if the engines are indeed identical, why
> do they have different horsepower ratings?
> The answer is simply that PZL is using brake horsepower and the Franklin uses
> indicated horsepower.  The difference between the two can be as high as 10 to
> 15 percent.  The difference in this case is about 7%.
> 
> All aircraft engines made in the USA have indicated horsepower on the
> nameplate.  For a detailed description of how these calculations are done, I
> refer you to FAA publication AC65-12A page 32.
> 
> Larry Coen
> N136LC
> 
> 
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=====
James F. Agnew
Jim_Agnew_2 at Yahoo.Com
Tampa, FL
Velocity 173 Elite Aircraft Completed & Flying


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